Tom,
The following info was found on Ancestry.com concerning Jonathan. You don't state here what exact info you are looking for. I do Merrill research all the time. I have over 500 pages of the Massachusetts family history that I have gathered over the years. I really only track the direct lines but if I know what you are missing, I can be on the look out as I do my own research.
Molly
Massachusetts Marriages, 1633-1850 Massachusetts Marriages, 1633-1850
Name: Jonathan, Jr. Merrill
Gender: Male
Spouse: Margaret Clark
Marriage Date: 26 May 1822
City: Methuen
County: Essex
Source: Family History Library, Salt Lake City, UT, Film # 0760383 & 0887746.



Source Information:

Dodd, Jordan, Liahona Research, comp.. Massachusetts Marriages, 1633-1850 [database on-line]. Provo, UT, USA: The Generations Network, Inc., 2005. Original data: With some noted exceptions all marriage records in this collection can be found at the Family History Library in Salt Lake City, Utah, and may be available through Family History Centers throughout the United States. See table below for information listed.

Thank you, Molly. I have a good share of the vital records for Jonathan and Margaret's family, but I don't have the marriage record for Frank and Lucy. My real interest is in building a history of the family, so I am looking for any journals, etc. that might exist. George was the editor of the Lawrence American, so there is some information there. Tom